I've build loads of wings & jumps, they're easily within the reach of a DIYer, there's nothing difficult about it. I used reclaimed timber which kept the costs really low. Most expensive thing is the cups. Best tip is don't use nails....screws & bolts do a much stronger job. I did proper wings but the below is as good as any for practice wings. http://lorienstable.com/articles/jumping/900-building_jumps/